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Chapter 13 - Puzzles Using Hexagonal or Rhombic Sticks
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PVITELLI.NET -
Chapter 7 - The Diagonal Burr
Copyright J. A. Storer
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Burr puzzle - Wikipedia
Amazon.com: Notched Stick 3D Wooden Puzzle Brain Teaser : Toys & Games
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Wooden Puzzle Box Brain-teaser IQ Games Wood Puzzle 3D - Etsy
Chapter 5 - The Six-Piece Burr
6 Wooden Puzzle Gift Set-108S
Notched Sticks wood brain teaser puzzle 2x2x2 Burr | eBay
